Car-door lock.



E. C. BROWN & W. B. MAY.

CAR DOOR LOCK.

APPLICATIUN FILED NOV. 28, 1914.

1,144,345. PatentedJune 29, 1915.

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CAR DOOR LOCK. APPL|CAT|0N FILED Nov. 28. 1914.

1 l 44, 345 Patented June 29, 1915.

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THE MORRIS PETERS CD.. PHOTO-LITHQ.. WASH/NGroN, D. C.

EDGAR C. BROWN AND WILLIE B. MAY, OF WADESBORO, NORTH CAROLINA.

CAR-noon Loox.

specification of Letters raient.

Patented J une 29, 1915.

To all whom it may concern.'

Be it known that we, EDGAR C. BROWN and WILLIE B. MAY, citizens of` theUnited States, residing at Wadesboro, in the county of Anson and Stateof North Carolina, have invented new and useful Improvements in Car-DoorLocks, of which the following is a specication. Y l The invention.relates to door locking mechanism, and more particularly to the class ofsliding door locks for use on grain or box cars. 1

The primary object of the inventionis the provision of a door lockwherein the door of agrain or box car is secure when closed and canonly'beunlocked for the opening thereof from beneath the body of the carand through-the use of a hand crank or key, thus obviating asurreptitious entry to the car through the doorway, the lockingmechanism being of novel form and construction to assure the perfectworking thereof.

AnotherV object of the invention is the provision of a door lock of'thischaracter wherein it will automatically fasten the door on the closingthereof, thereby obviating repeated use of the hand crank or key when itis desired to fasten the door.

A further object of fthe inventionis the provision of a door lock ofthis character wherein its mechanism is mounted solely within the bodyof the car and is operated from beneath the same to allow the opening ofthe door for an entrance to the car.

A still further object of the invention is the provision of a car doorlock of this character which is simple in construction, readily andeasily installed within the bodyof the car, thoroughly reliable andefficient yin its operation, automatically operable for the locking ofthe door closed, and also which is inexpensive in manufacture.

With these and other objects in view, the invention consists in theconstruction, combination and arrangement of parts as will behereinafter fully described, illustrated in the accompanying drawing,and pointed out in the claims hereunto appended.

1n the' drawing Figure 1 is a fragmentary side-levation of a box carwith its door, the locking mechanism constructed in accordance with theinvention being within and the door fastened closed. Fig. 2 is a`vertical transverse sectional view through the car. Flg. 1s a sectionalview onl the line 3-3 of Fig. 1, showing the lock mechanism in top plan.p Fig. 4 is a vertical longitudinal sectionalview through the car.

Similar reference characters indicate corresponding parts throughout theseveral views in the drawings.

Referring tothe drawings in detail, A designates generally a portion ofthe body of the car, which is of the grain or box type, and B thesliding door at the `side thereof for closing the doorway therein, asusual, the door lbeing supported through the medium of hangers 10 andtracks 11of any ordinary well-known construction for permitting movementthereof to opened or closed position. Mounted interiorly of the body Aof the car is the door locking mechanism hereinafter fully described.` 1

The door locking mechanism comprises a sliding latch bolt 12 having thelatch end thereof rounded, while its remaining portion is of squaredformation in cross section, and is disposed transversely of the body Aof the car to move horizontally, the rounded end of the said bolt beingslidable through a guide plate 13 which is fixed on the inner face ofthe outer side wall of the body A, and this rounded end of the said boltis of a length to project through the side of the body A so as tonormally intersect the path of movement of the door B for the locking ofthe same closed. 1

Located at one side and slightly below the bolt 12 and lixed interiorlyof the body A on the outer side wall thereof is a bracket 14; forming a`bearing for a vertically disposed operating shaft 15 which also passesthrough a bearing plate 16 xed to the flooring ofthe body of the car,the shaft being projected through the flooring into a recess 17 thereinso as not to protrude beneath the bottom of the car, the end of theshaft l5 within the ,said recess 17 being squared as at 18 for thedetachable connection thereof with a crank or key 19 which is used forthe turning of the shaft to operate the lock mechanism hereinafter morefull described. Fixed to the bottom of the body A of the car exteriorlythereof and surrounding the recess 17 therein is an escutcheon plate 20lthrough which is introduced the crank or key 19 for its engagement withthe shaft when the lock mechanism is to be operated for the unlocking ofthe door.

0n the shaft labove the bracket 14 is a disk 21 formed with therespective arms 22 and 27, the said arm 22 being formed with abifurcation 23 in which is engaged a lug 24 fixed in and depending fromthe sliding latch bolt 12 so that on the turning of the diskv 21 thelatch bolt 12 will be thrown in one'direction for retracting it topermit the opening of the door when the shaft is rotated. Swinginglyconnected to the bracket 14 is a trip vcam plate 25 carrying a trip cam26, with the cam surface of which is adapted to engage the arm 27, whichserves as a trip arm formed on the said disk 21, the plate 25 beingconnected with the bracket 14 through the medium of a hinge 28 to permitvertical swinging movement under the action of the trip arm 27 when thelock mechanism is operated.

Pivotally supported above the latch bolt 12 is a locking detent 29, thepivot 30 therefor being `disposed near one end, while mounted on theshorter end of the said detent 29 is a link 31 which is also connectedto the swinging plate 25, and on the longer end of the detent 29 iscarried a weight 32 which serves. to gravitate the said detent intolocking engagement in a notch 33 formed in the bolt 12 so as to preventthe sliding thereof to released position after it has been thrown forlocking the door B closed.

Connected with the bearing plate 13 is one end of a coiled retractilespring 34 which has its opposite end connected with the bolt `12 so thatwhen it has been thrown to unlatching position by operating the shaft 15and the door opened the said spring will serve to automatically throwthe bolt 12' to locked position when the door is closed.

In the operationoof the locking mechanism, it will be assumed that thedoor B has been closed and the locking mechanism is in a position forfastening the door. Now, to open the door it is necessary to engage thekey 19 with the squared end 18 of the shaft 15, and this is accomplishedby going beneath the body A of the car, whereupon on the turning of thecrank the shaft 15 is rotated, and simultaneously therewiththe disk 21is turned so that the trip arm or extension 27 will travel onto the cam26, depressing the plate 25, which causes the lifting of the detent 29for disengaging it from the notch 33 in the bolt 12, and while the armor extension 27 is traveling upon the cam 26 the forked arm 22 is movedso that its fork 23 will act upon the lug 24 to shift the bolt 12 toretracted position against the tension of the spring 34, and when thesaid bolt has been fully retracted the door is free to be opened. Onswinging the door to opened position the bolt 12 will be held in itsunlatched position so that on the closing of the door the same will belatchedautomatically under the action of the spring 34 acting upon thesaid bolt 12 without the use of the crank or key 22, thus it being seenthat when the door is locked the detent 29 will engage in the notch 33in the bolt so that it cannot be pushed inwardly from without the v car,thereby preventing a surreptitious entry to the same, as an entry canonly be made when the crank or key 22 is used for the turning of theshaft 15 to operate the lock mechanism for the door.A l y It is` ofcourse to be understood that in lieu of the use of a single latch bolt12 any number of `the. same-may be employed and their operationleifectedin. a manner as'hereinbefore set forth.

a From ythe foregoing description, taken in connection with theaccompanying drawings, the-construction and manner of operationv of thedevice will beclearly understood,

and therefore a more extended explanation has been omitted.

What is claimed is 1.. The combination with a sliding door for a car, oflocking mechanism` comprising a sliding bolt movable4 into the `path ofmovement of the door for fastening the same closed, a shaft mountedwithin the car and exposed at one end through the bottom thereof, alocking detent engageable with the bolt when fastening the door, andmeans actuated by the shaft for synchronously releasing` the detent andthrowing the bolt.

2. The combination with a sliding door for a car, of locking mechanismcomprising sameclosed", a shaftV mounted within the car l andexposed atone end through the bottom thereof, a locking detent engagea-ble withthe bolt when fastening lthedoor, means actuatedby the shaft forisynchronouslyreleasing the detent and throwing the bolt,

means for automatically resettingthe bolt when` the door has beenclosed,`and 'means for gravitating the detent on the resetting of hebolt for-locking engagement therewit l 4. The combination, withl asliding door for a car, of locking mechanism comprising a` sliding boltmovable `into the path of movement of the door for fastening the sameclosed, a shaft, mounted within the car and exposed at one end throughthe bottom thereof, a looking detent engageable with shaft from withoutthe car Jfor operating 10 the bolt when fastening the door, means acsaidshaft.

tuated by the shaft for synchronously re- In testimony whereof we aiiixour signaleasing the detent and throwing the bolt, tures in presence oftwo witnesses.

means for automatically resetting the bolt EDGAR C. BROWN. when the doorhas been closed, means for WILLIE B. MAY. gravtating the detent on theresetting of Witnesses:

the bolt for locking engagement therewith, W. K. BoGGAN,

and means for detachably engaging the D. M. JOHNSON.

Copies of this patent may be obtained for ive cents each, by addressingthe Commissioner of Patents, Washington, 1).'0.

